PropertyEditor.java

/**
 * Licensed to Neo Technology under one or more contributor
 * license agreements. See the NOTICE file distributed with
 * this work for additional information regarding copyright
 * ownership. Neo Technology licenses this file to you under
 * the Apache License, Version 2.0 (the "License"); you may
 * not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied. See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
package org.neo4j.neoclipse.property;

import java.io.IOException;

import org.eclipse.jface.viewers.CellEditor;
import org.eclipse.jface.viewers.TextCellEditor;
import org.eclipse.swt.widgets.Composite;
import org.neo4j.neoclipse.property.PropertyTransform.PropertyHandler;

/**
 * Editors used for property values.
 * 
 * @author Anders Nawroth
 */
public enum PropertyEditor
{
    NONE
    {
        @Override
        CellEditor getEditor( final Composite parent,
                final PropertyHandler propertyHandler )
        {
            return null;
        }
    },
    TEXT
    {
        @Override
        CellEditor getEditor( final Composite parent,
                final PropertyHandler propertyHandler )
        {
            return new PropertyCellEditor( parent, propertyHandler );
        }
    };
    /**
     * Get actual editor for this property editor type.
     * 
     * @param parent parent object
     * @param propertyHandler
     * @return cell editor for a property object
     */
    abstract CellEditor getEditor( Composite parent,
            PropertyHandler propertyHandler );

    public static class PropertyCellEditor extends TextCellEditor
    {
        private final PropertyHandler propertyHandler;
        private Object untouched = null;

        public PropertyCellEditor( final Composite parent,
                final PropertyHandler propertyHandler )
        {
            super( parent );
            this.propertyHandler = propertyHandler;
        }

        @Override
        protected Object doGetValue()
        {
            String value = text.getText();
            if ( !propertyHandler.isType( String.class )
                 && "".equals( ( value ).trim() ) )
            {
                return untouched;
            }
            try
            {
                return propertyHandler.parse( value );
            }
            catch ( IOException e )
            {
                e.printStackTrace();
            }
            return untouched;
        }

        @Override
        protected void doSetValue( final Object value )
        {
            untouched = value;
            super.doSetValue( propertyHandler.render( value ) );
        }

        @Override
        protected boolean isCorrect( final Object value )
        {
            if ( value instanceof String
                 && "".equals( ( (String) value ).trim() ) )
            {
                return true;
            }
            return super.isCorrect( value );
        }
    }
}